Free Shipping. Sterling Rope 6mm Accessory Cord DECENT FEATURES of the Sterling Rope 6mm Accessory Cord Durable sheath and high MBS Great for prusik cords, cordelettes, ice threads, lightweight low-stretch fixing and hauling in.tagin. lines. Can also be used in non-life safety applications such as dog leashes, towlines, or even as decorative trim and cover. The SPECS MBS lbs kN: 1,978 8.8 ALL CLIMBING SALES ARE FINAL.